A Chimeric Protein Comprised of IL-4 and Pseudomonas Exotoxin Is Cytotoxic for Activated Human Lymphocytes

J Immunol. 1994 Apr 1;152(7):3693-700.


IL4-Pseudomonas exotoxin (IL4-PE4E) is a chimeric molecule in which human IL-4 is genetically fused to the mutated binding domain of Pseudomonas exotoxin. This molecule binds specifically to human IL-4 receptor-bearing cells. IL4-PE4E was extremely cytotoxic to highly purified anti-CD3-activated CD8+ T lymphocytes. The cytotoxic activity of this molecule was dependent on the activation state of CD8+ T cells: 3- and 4-day activated T cells were very susceptible to the cytotoxic activity of IL4-PE4E compared with 0- to 2-day activated cells. PHA-activated lymphocytes and PBL activated in mixed lymphocyte reaction were also highly sensitive to IL4-PE4E. CD16+ and/or CD56+ highly purified NK cells or highly purified, IL-2-activated NK cells were also very sensitive to the cytotoxic effect of IL4-PE4E. IL-2-activated LAK cells had little susceptibility after 1 day but were very sensitive to IL4-PE4E after 3 days. The cytotoxic effects of IL4-PE4E were mediated through a ligand receptor interaction because excess rIL-4 abrogated these effects as did a neutralizing Ab to human IL-4. A chimeric mutant protein that can bind to IL-4 receptors but lacks the ability to inhibit protein synthesis was not cytotoxic to activated lymphocytes. The IL4-PE4E-mediated cytotoxicity of activated T cells correlated with the level of expression of IL-4 receptors on these cells. CD8+ T cells activated for 3 days expressed the highest density of IL-4 receptors compared with 1- or 2-day activated cells. Among two chimeric toxins tested only IL4-PE4E was cytotoxic to 2-day anti-CD3-activated CD8+ T lymphocytes, whereas IL6-PE4E was not active at all. These studies suggest that human IL4 toxin could be a potent agent for the elimination of activated lymphocytes in allograft rejection, some autoimmune diseases, or treatment of lymphomas and leukemias.

Publication types

  • Comparative Study

MeSH terms

  • ADP Ribose Transferases*
  • Bacterial Toxins*
  • CD8 Antigens / analysis
  • Exotoxins / chemistry*
  • Interleukin-4 / chemistry*
  • Isoantigens / immunology
  • Killer Cells, Lymphokine-Activated / drug effects
  • Killer Cells, Natural / drug effects
  • Lymphocyte Activation / drug effects*
  • Lymphocyte Subsets / drug effects*
  • Phytohemagglutinins / pharmacology
  • Receptors, Interleukin-4
  • Receptors, Mitogen / metabolism
  • Recombinant Fusion Proteins / toxicity*
  • Structure-Activity Relationship
  • Virulence Factors*


  • Bacterial Toxins
  • CD8 Antigens
  • Exotoxins
  • Isoantigens
  • Phytohemagglutinins
  • Receptors, Interleukin-4
  • Receptors, Mitogen
  • Recombinant Fusion Proteins
  • Virulence Factors
  • Interleukin-4
  • ADP Ribose Transferases
  • toxA protein, Pseudomonas aeruginosa